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Treatment solution for preparing aluminum alloy surface amorphous composite passivation film, preparation method and application

A technology of aluminum alloy surface and treatment solution, which is applied in the coating process of metal materials, etc., can solve the problems of poor solution stability and low film-forming efficiency of chromium-free treatment solution.

Inactive Publication Date: 2010-11-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can not only solve the problems of low film-forming efficiency and poor solution stability of the current chromium-free treatment solution, but also obtain a golden yellow amorphous composite passivation film with corrosion resistance, heat resistance, boiling water resistance and good adhesion, so as to realize on-site judgment At the same time, it overcomes the colorless defect of the titanium-zirconium system conversion film

Method used

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  • Treatment solution for preparing aluminum alloy surface amorphous composite passivation film, preparation method and application
  • Treatment solution for preparing aluminum alloy surface amorphous composite passivation film, preparation method and application
  • Treatment solution for preparing aluminum alloy surface amorphous composite passivation film, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Example 1: Composite passivation treatment on the surface of 6063 aluminum alloy profiles

[0076] The aluminum alloy surface composite passivation treatment method comprises the following steps:

[0077] (1) Pretreatment

[0078] (a) Take a sample piece from a 6063 large-size aluminum alloy profile, and polish it with SiC water sandpaper until the surface roughness is 10 microns;

[0079] (b) First place the sample at a temperature of 50°C and a concentration of 40g L -1 Sodium hydroxide solution to degrease and degrease for 1 minute, then rinse with deionized water;

[0080] (c) Put the test piece into 15% (weight) dilute nitric acid solution and soak for 1 minute to remove ash, then rinse it with deionized water, and dry it with a hair dryer;

[0081] (d) the test piece is placed into the mixed acid solution (the weight percentage of the mixed acid solution is: 40% H 2 SO 4 , 10%H 3 PO 4 , 3% HF, and the rest are deionized water) for 1 minute, then rinse with de...

Embodiment 2

[0085] Example 2: Composite passivation treatment on the surface of 6063 aluminum alloy profiles

[0086] The processing method of the present embodiment is the same as embodiment 1,

[0087] Composite passivation treatment solution configuration: configure 1000ml composite passivation treatment solution, in which the weight-to-volume ratio concentration of various components in the treatment solution is as follows: cerium nitrate 5g L -1 , sodium bismuthate 3g·L -1 , potassium permanganate 1g·L -1 ; Ammonium bifluoride 0.1g L -1 , composite stabilizer 0.5g·L -1 (wherein boric acid 0.2g·L -1 , acetic acid 0.3g·L -1 ), adjusted to pH 1.8 with dilute nitric acid.

[0088] The aluminum alloy surface composite passivation treatment method is similar to that of Example 1, but the treatment time is slightly longer than that of Example 1, which is 5 minutes. Wherein the treatment solution is prepared and left for 1 hour to start the conversion treatment.

[0089] The film lay...

Embodiment 3

[0090] Example 3: Composite passivation treatment on the surface of 6063 aluminum alloy profiles

[0091] The treatment method of this embodiment is the same as that of Example 1, and the configuration of the composite passivation treatment solution: 1000 ml of the composite passivation treatment solution is configured, wherein the weight-to-volume ratio concentration of various components in the treatment solution is as follows: cerium nitrate 15g L -1 , Sodium bismuthate 10g·L -1 , potassium permanganate 3g·L -1 ; Ammonium bifluoride 0.5g L -1 , composite stabilizer 1.5g L -1 (wherein boric acid 0.5g·L -1 , acetic acid 1g·L -1 ), the pH of the passivation solution is 2.5.

[0092] The aluminum alloy surface composite passivation treatment method is similar to that of Example 1, but the treatment solution is prepared and placed for 15 days before conversion treatment, and the treatment time is 5 minutes.

[0093] After passivating the 6063 aluminum alloy with the passiv...

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Abstract

The invention discloses treatment solution for preparing an aluminum alloy surface amorphous composite passivation film, a preparation method and application. A formula of the treatment solution comprises 5 to 15g / L of corrosion inhibiting negative ion-containing rare earth salt, 3 to 10g / L of catalyst type composite oxidant, 1 to 3g / L of auxiliary oxidant, 0.1 to 0.5g / L of buffering film-forming accelerator and 0.5 to 1.5g / L of composite stabilizer. The treatment solution does not contain any toxic chromium or organic substances, does not need heating during conversion treatment of 2 to 5 minutes, and can prepare the golden amorphous 'rare earth-manganese' composite passivation film with excellent performance on the aluminum alloy surface. The treatment solution well solves environmental pollution and human harm caused by the present hexavalent chromium treatment, and can overcome the defects that a zirconium titanate series conversion film is colorless and field judgment cannot be realized. The preparation method has the advantages of simple process, simple and convenient operation and low cost, and is easy to realize industrialization.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy corrosion and protection, in particular to a treatment liquid for preparing an amorphous composite passivation film on the surface of an aluminum alloy, a preparation method and an application. Based on the characteristics of the amorphous material, the obtained conversion coating has excellent corrosion resistance, and the film layer is golden yellow, which is conducive to the realization of online judgment. Background technique [0002] Aluminum alloy is the second most used metal material after steel. Under atmospheric conditions, an extremely thin oxide film can be formed on the surface of aluminum alloy to make it have a certain corrosion resistance. However, this spontaneous oxidation film is easily damaged, especially in the presence of Cl - In the environment, pitting corrosion, crevice corrosion, stress corrosion and other damages are prone to occur. In order to improve the corr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34
Inventor 李文芳张凯杜军
Owner SOUTH CHINA UNIV OF TECH
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